[Pidgin] #9476: Add support for file transfer thumbnails for XMPP

[Pidgin]

#9476: Add support for file transfer thumbnails for XMPP
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 Reporter:  malu                      |        Owner:  malu        
     Type:  enhancement               |       Status:  new         
Milestone:                            |    Component:  unclassified
  Version:  2.5.7                     |   Resolution:              
 Keywords:  file transfer thumbnails  |  
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Comment(by malu at pidgin.im):

 (In [e968dce6e9f1a0688dff7463f0b6ec5458fd7c42]):[[BR]]
 Added a skeleton for functions to set and get a thumbnail image associated
 with a file transfer and provision for a UI op to let a UI "manufacture"
 a thumbnail.
 Refs #9476

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Ticket URL: <http://developer.pidgin.im/ticket/9476#comment:1>
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